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三角比を求めよう！
Author:
田村T
,
hamada
GeoGebra
New Resources
接点の作る円は内接円
円の伸開線
standingwave-reflection
正１７角形 作図 regular 17-gon
フーリエ級数展開
Discover Resources
外角の和４
サイン（正弦）の比
toudai 62-3
いろいろ
comparing AffineRatio with ExtendedAffineRatio
Discover Topics
Similar Triangles
Conic Sections
Trigonometry
Constructions
Circle